GPS可提供全天候的精确位置与定时信息，但GPS卫星信号较弱，任何障碍物都会影响其信号的接收。
GPS can provide accurate position and time information all-weather. But GPS signal is so feeble that any barrier can affect the receiving of the signal.
一旦当他逾越了心理上的障碍而做出决定时，准备的势头就开始了。
Once he had leaped the psychological hurdle toward decision the momentum of preparation took over.
两名病人表现颞下颌疼痛和功能障碍在稳定时期认为是造成咬合不稳定。
Two patients manifested temporomandibular pain and dysfunction during the stabilization period thought to be caused by occlusal instability.
应用推荐